Under-Knuck 

The act of throwing a knuckle ball underhand style usually in slow pitch softball.

Man, the pitcher on the other team struck out our entire side by getting us all with his under-knuck!

Under-Knuck by Niptuckman1 September 25, 2010

Knuckle under 

To not put up with, tolerate or endure.

"He is was looked at in awe for his disagreement to knuckle under"

Knuckle under by justjae1114 February 11, 2022

Knock It Under The Bed 

knocking your shlong under THE bed.

Adamn: Hey Ben what is up my niggy
Ben: Nothing just gonna Knock It Under THE Bed when i get home
Adamn: Can I join?
Ben: Only if you wear socks.
Adamn: Why is that?
Ben: Because if you wear socks nothing you do is gay.
Adamn: NOICE

Knock It Under The Bed by zmillz1125 June 14, 2018

knock the props out from under 

knock the props out from under (someone/something)

- destroy someone's confidence,
- destroy someone's emotional/financial/moral base

Adam will knock the props out from under Susan if he criticizes too much about her work

knock the props out from under by cdawg543 February 23, 2008

UNDERKNUCKLE 

VERB

1. THE ACT OF TURNING THE POUND (FIST BUMP) UPSIDE DOWN

2. A DIFFERENT FORM OF FISTING WHERE THE FIST IS INSERTED (IN A PALM UP FASHION) INTO THE VAGINA OR ANAL CAVITY

WHEN TWO PEOPLE GREET EACH OTHER WITH A FIST BUMP, THEN TURN THE FIST BUMP UPSIDE DOWN AT THE SAME TIME, THAT IS CALLED AN UNDERKNUCKLE.

UNDERKNUCKLE by Segue Taylor March 5, 2020

Underknockers 

Slang term for bras, mirroring the ubiquitous 'under crackers' for downstairs lingerie.

There's nothing I like better than peeling my sweaty underknockers off when I get home from a long day at work

Underknockers by LauraLovesPotatoes February 18, 2021